Karim Erzini

Karim Erzini
Universidade do Algarve | UALG · Centro de Ciências do Mar (CCMAR)

PhD Biological Oceanography, University of Rhode Island (1990)

About

338
Publications
94,082
Reads
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7,558
Citations
Additional affiliations
July 2022 - present
Universidade do Algarve
Position
  • Professor (full)
Description
  • Artisanal / small-scale fisheries, recreational fisheries, gear selectivity, fisheries management, marine protected areas, conservation, fisheries ecology, population dynamics, impacts of fishing, by-catch and discards, acoustic telemetry.
October 1990 - May 2021
Universidade do Algarve
Position
  • Professor (Full)
Description
  • MSc courses: Fisheries Biology and Ecology, Fisheries Technology and Stock Assessment, Marine Population Biology, Scientific Communication, Trophic Dynamics, Modelling Undergraduate courses: Population dynamics

Publications

Publications (338)
Article
Full-text available
In the multi-gear coastal fleet in the Algarve (South Portugal), fishers own licenses for various fishing gears. However, they generally do not use all these licenses, and therefore, it is difficult to estimate the impacts this fleet has on the local environment. In this study, two types of questionnaires were used directed to the local fishers fro...
Article
The coastal waters off Western Iberia are an important fishing ground and a marine megafauna foraging area. Overlap between fishery target species and the diet of several air breathing marine megafauna species can lead to negative interactions and consequently conservation and economic issues. This work aimed to assess marine megafauna (cetaceans,...
Article
The short-term site fidelity of intertidal fish species was studied in a rocky intertidal zone in southern Portugal using visible implant elastomer tagging. Eleven fish species were caught, tagged and released, seven of which were recaptured. The larger tide pool with the highest complexity level and located at a lower position in the shore level d...
Article
Full-text available
Accuracy in reporting captures is a key element to achieve fisheries sustainability. However, identification of the catches might be a challenge when two or more species are morphologically similar and caught jointly, like the mixed fisheries of black hakes in East Atlantic African waters. Black hakes ( Merluccius senegalensis and M. polli ) are to...
Article
Full-text available
This work is the result of an international research effort to determine the main impacts of the COVID-19 pandemic on marine recreational fishing. Changes were assessed on (1) access to fishing, derived from lockdowns and other mobility restrictions; (2) ecosystems, because of alterations in fishing intensity and human presence; (3) the blue econom...
Article
Full-text available
The multi-gear coastal vessels in the Algarve (South Portugal) own licenses for various fishing gears. However, it is generally uncertain what gears they use, which is problematic as each individual gear is responsible for unique impacts on the resources and the environment. In this study, landing profiles identified for the multi-gear coastal flee...
Article
Microplastic (MP) pollution is increasing worldwide and affecting aquatic fauna in different ways, which endangers current aquatic resources in a still unknown extent. MP-induced threats to marine fauna are critical for developing countries, where waste treatment may be not optimal and coastal communities rely heavily on marine resources for dietar...
Article
While bycatch, the unintentional catch of untargeted species, is one of the main threats to large marine species such as cetaceans, reef sharks and turtles, also known as megafauna, fishers can also be negatively impacted by bycatch. Understanding local fisheries profiles, fishers’ demography and their opinion is thus a necessary part of the strate...
Article
Following the implementation of the European Council EC Regulation 2016/2336, which restricts bottom trawling below 800 m for vessels capturing deep-sea fish species, the quantification and characterization of the fishing activities at those depths became essential to evaluate potential negative economic impacts. In this study, the activity of the...
Technical Report
Final report/relatório final do Projeto iNOVPESCA - Redução de capturas acidentais de espécies marinhas protegidas em pescarias costeiras algarvias: inovação de procedimentos e técnicas de mitigação. Contextualização, metodologia, resultados e proposta de boas práticas para encontrar reduzir conflitos entre pescas e espécies marinhas protegidas na...
Article
• The implementation of marine protected areas (MPAs) has been widely used as a tool to manage and conserve marine resources and services. Yet, to date, the reserve effect is still weakly evaluated, particularly for soft‐sediment habitats. • The Arrábida MPA, considered as a biodiversity hotspot, was fully established in 2009 on the west coast of P...
Article
Full-text available
The recent establishment of the “landing obligation” under the reformed EU Common Fishery Policy has the twofold objective of reducing the excessive practice of discarding unwanted catch at sea and encouraging more selective and sustainable fisheries. Within this context, the awareness of the spatial distribution of potential unwanted catches is im...
Article
Full-text available
This is the first attempt to apply an expert-based ecological vulnerability assessment of the effects of climate change on the main marine resources of Portugal. The vulnerability, exposure, sensitivity, adaptive capacity, and expected directional effects of 74 species of fish and invertebrates of commercial interest is estimated based on criteria...
Article
Smartphone applications (apps) that target recreational fishers are growing in abundance. These apps have the potential to provide data useful for management of recreational fisheries. We surveyed expert opinion in 20, mostly European, countries to assess the current and future status of app use in marine recreational fisheries. The survey revealed...
Article
Full-text available
Current fishing practices often do not allow adequate selection of species or sizes of fish, resulting in unwanted catches, subsequently discarded, with the consequent negative effects on both marine communities and fisheries profitability. The cross-analysis of density patches of potential unwanted catches and distribution of fishing effort can su...
Technical Report
Full-text available
This document serves as the first proposal for management recommendations (MR1) for each of the FarFish case studies. MRs are formal arrangements between a management authority and the operators in the respective case studies. It specifies the partners in the fishery and their respective roles, the agreed objectives for the fishery, the management...
Article
Full-text available
With the global increase of marine protected area (MPA) implementation, the need for monitoring and the evaluation of their effectiveness becomes ever more important. Currently there is a severe lack of information about the protection effects of soft-substrate ecosystems. While many different methods have been established for the monitoring of har...
Article
Discards is an important issue in fisheries around the world. The spatial management of discards has attracted interest as a potential tool for minimizing the unwanted catch. The aim of the present work was to identify areas with high quantities of bottom trawl discarded catch regarding species subjected to MCRS, in six areas of southern European w...
Article
Discarding has been a common practice in multispecies trawl fisheries since the first trawlers were used. To date there have been no studies reporting an integrated analysis of discarding in the gulf of Cadiz (SW Spain, GoC) to evaluate and support the latest fisheries policies, specifically the Landing Obligation (European Union Regulation 1380/20...
Conference Paper
Full-text available
The European Union Regulation 1380/2013 revising the Common Fisheries Policy (CFP) aims at addressing the by-catch and discarding problem in commercial fisheries by implementing the "Landing Obligation" of the regulated species by 2019. At present, the Gulf of Cadiz (GoC) landing ports are not ready to comply with this regulation. Within this frame...
Article
Marine recreational fishing (MRF) in Portugal is a traditional leisure activity with considerable importance for coastal populations. In the absence of available information from the national data collection framework, this article aims to review the existing information on MRF across the country. MRF was an open access fishery until recently, but...
Article
Previous laboratory feeding experiments, representing the state-of-the-art methodology to investigate micro-plastic (MP) ingestion and its impact for fish, tend to disregard both the significance of applying realistic MP densities and the potential relevance of biofilm-coating for ingestion probability. This experiment assessed the uptake of either...
Article
Full-text available
The perceptions of fishers towards the Arrábida Marine Park, a marine protected area (MPA) in the west coast of Portugal, were studied through face-to-face interviews in two different moments of the MPA life cycle. Fishers' perceptions about the MPA and the impact it had on the fishing activity over time were identified just before the full impleme...
Article
The implementation of spatial protection measures is currently a priority in batoid species' conservation strategies, but their spatial ecology remains largely unknown. We provide some preliminary insights into the movement patterns of the white skate (Rostroraja alba), a batoid classified as Critically Endangered in European waters. Three individu...
Article
The European Union Regulation No 1380/2013 revising the Common Fisheries Policy (CFP) aims at addressing the by-catch and discarding problem in commercial fisheries by implementing the “Landing Obligation” of the regulated species by 2019. At present, the gulf of Cádiz (GoC) landing ports are not ready to comply with this regulation; a number of ke...
Article
Current international commitments on ocean protection targets include protecting 10% of the ocean through marine protected areas (MPAs) until 2020, while also complying with efficiency and equity requirements. This has led to a race to designate large MPAs, but despite the valid marine conservation efforts, conferring adequate protection is still a...
Technical Report
Full-text available
This report contains an evaluation of the governance structures of the EU long-distance fishing fleet in the six case studies of the FarFish project. These case studies include two high-seas fisheries and four fisheries that are based on Sustainable Fisheries Partnership Agreements (SFPAs) between the EU and coastal states. All of these fisheries a...
Preprint
Full-text available
The concentration of the population in coastal regions, in addition to the direct human use, is leading to an accelerated process of change and deterioration of the marine ecosystems. Human activities such as fishing together with environmental drivers (e.g. climate change) are triggering major threats to marine biodiversity, and impact directly th...
Article
The rule of thumb in marine trophodynamics indicates that the bigger an organism, the higher its trophic level (TROPH). This generalization leads to the assumption that fishes increase their TROPH with growth. However, a recent review showed that for many species, TROPH does not increase with body size, suggesting that size-independent feeding is n...
Article
Full-text available
Introduction The growth in tourism in the Cape Verdean Sal Island has been a cause as well as a consequence of a number of investments (both by the State and the private entities) to create synergies for that sector, ensuring and promoting the island’s touristic attractiveness. Such increases in the number of visitors, allied with the island’s mari...
Conference Paper
Full-text available
The European Union Regulation 1380/2013 revising the Common Fisheries Policy (CFP) aims at addressing the by-catch and discarding problem in commercial fisheries by implementing the "Landing Obligation" of the regulated species by 2019. To date, in adjacent waters of the Mediterranean sea, the Gulf of Cadiz (GoC) landing ports are not ready to comp...
Chapter
Full-text available
Along the Portuguese continental coast, the Sardine Portuguese Purse Seine Fishery (SPPSF) interacts with dolphins, particularly with the common dolphin, Delphinus delphis. The level of this interaction is directly correlated with fishing effort and sardine, Sardina pilchardus, catch. This is mainly attributed to the fact that sardine, the target o...
Article
Full-text available
Introducción: La pesquería de jaiba de la Ciénaga Grande de Santa Marta está sometida a una fuerte presión sobre los individuos inmaduros, lo que ha conllevado a su sobrepesca. Objetivo: Se determinaron la dimensión y la ubicación de ventanas de escape para facilitar la salida de individuos con tamaños no deseados. Materiales y métodos: Mediante...
Preprint
Full-text available
The global number of marine protected areas grew exponentially in the last decade to meet international targets. Most of them are partially protected areas (PPAs). Yet, their ecological effectiveness remains unclear due to the high variability of allowed uses. Here, we performed the first global meta-analysis of PPAs following a new regulation-base...
Article
We used a new, easy to use, highly selective, low impact and cheap method of sampling in the swash zone of a sandy beach to obtain catch per unit effort data (CPUE) for Pennant's swimming crab, Portumnus latipes (Pennant, 1777). Metal stakes baited with sardines were used to attract the crabs that were caught by hand. Crab density was estimated bas...
Conference Paper
Full-text available
Recreational fishing is an important socioeconomic activity that needs systematic studies and data monitoring programs. The Pescardata project, coordinated by the Centre for Marine Sciences of the University of Algarve has two goals: (1) fill the gaps with regard the systematic collection of data on the recreational catches of the species included...
Article
Full-text available
We analyzed three acoustic telemetry datasets of single tagged individuals to argue that, at a time of data deficiency, “solo datasets” have the ability to uncover singular patterns. Here, a greater amberjack (Seriola dumerili), a female school shark (Galeorhinus galeus) and a Salema, (Sarpa salpa) provided relatively long and insightful individual...
Article
Full-text available
Experimental fishing was conducted off the port of Quarteira (southern Portugal) from October 2016 to February 2017 using standard trammel nets and modified nets rigged with a guarding net. The commercial catches of trammel nets rigged with a guarding net were 46.1% and 38.0% less than those of the standard net in numbers and economic value. Howeve...
Article
A Sort‐X grid device with four different bar‐spacing grids (25, 30, 40 and 50 mm) was tested in the Gulf of Cádiz (GoC) on‐board commercial trawlers. A total of 83 fish, five crustacean and nine cephalopods species were sampled in 282 hauls. Most of the target and commercial bycatch species were sorted out by the grid with the exception of hake. Me...
Article
Full-text available
The number of marine protected areas (MPAs) has grown exponentially worldwide over the past decade in order to meet international targets. Most of these protected areas allow extraction of resources and are therefore designated as “partially protected areas” (PPAs). However, the effectiveness of PPAs remains unclear due to the high variability of u...
Article
Full-text available
Although the bivalve dredge used on the Algarve coast (southern Portugal) is highly selective for the target species , in some periods of the year the bycatch can exceed the catch of the commercial species. The present study aimed to quantify the bycatch and discards, estimate damage and mortality, and propose management measures to minimize discar...
Article
Full-text available
Numerous studies over the last decades have focused on marine protected areas (MPAs) and their effects on fish communities. However, there is a knowledge gap regarding how species that live associated with soft-substrates (e.g., sand, mud) respond to spatial protection. We analyzed abundance, biomass and total lengths of the soft-bottom fishes in a...
Data
Barplots of fish abundance and biomass per protection level and substrate Barplots of mean (±standard error) fish abundance (A: CPUE n⋅500 m−1) and biomass (B: BPUE kg⋅500 m−1) per protection level and substrate (sand, mud).
Data
Mean species abundance and biomass for each protection level and period Mean (and standard error - SE) species abundance (CPUE - n⋅500 m−1) and biomass (BPUE - kg⋅500 m−1) according to period (Period 1, Period 2) and protection level (BA - buffer area; PPA - partially protected area; FPA - fully protected area). Only species with frequency of occur...
Data
Discriminant species at each leaf of the multivariate regression tree Discriminant species at each leaf (terminal node) of the multivariate regression tree analysis (Leaf I - Muddy BA & PPA; Leaf II - Muddy FPA; Leaf III - Sandy BA; Leaf IV - Sandy PPA & FPA, Period 1; Leaf V - Sandy PPA & FPA, Period 2). Indicator values (IndVal) are shown (specie...
Data
List of fish species sampled during the experimental fishing surveys List of fish species sampled during the experimental fishing surveys in the Luiz Saldanha Marine Park, and corresponding references (full references in File S1) used for length-weight (L-W) relationships (for all species except pelagics). The environment, maximum length reported (...
Data
Mean species total length for each protection level and period Mean total length (TL - cm) per species according to period (Period 1, Period 2) and protection level (BA - buffer area; PPA - partially protected area; FPA - fully protected area). Only species with frequency of occurrence higher than 15% are shown.
Data
Mean species abundance for each substrate type Mean (and standard error - SE) species abundance (CPUE - n⋅500 m−1) per substrate type. Only species with frequency of occurrence higher than 15% are shown.
Data
Species frequency of occurrence Table with frequency of occurrence of the species included in the analyses (FO%; percentage of samples with presence of each species). Species code (used in Fig. 6) and family are also shown (species ordered according to decreasing FO%).
Data
Mean species abundance in each leaf - multivariate regression tree Mean (and standard error - SE) species abundance (CPUE - n⋅500 m−1) in each leaf of the multivariate regression tree analysis (MRT) (Leaf I - Muddy BA & PPA; Leaf II - Muddy FPA; Leaf III - Sandy BA; Leaf IV - Sandy PPA & FPA, Period 1; Leaf V - Sandy PPA & FPA, Period 2).
Data
Summary table of the ratios analyses and multivariate regression tree Summary table of the ratio (Protected area:Buffer area; After MPA Full Implementation:Before MPA Full Implementation) analyses (N - abundance, B - biomass, L - total length) and multivariate regression tree (MRT) (MRT Ind Spp - cluster where the species was assigned as indicator)...
Data
Table of additional information of species traits: fisheries category and reproduction Additional information of species traits: taxonomic family, environment, maximum length, market price and reproduction (mode, length and age at maturity) (references of length/age at maturity listed). Fisheries category is shown in the ‘price per kg’ column: T -...
Data
Table of additional information of species traits: longevity and movement pattern Additional information of species traits: maximum reported age, theoretical longevity (based on Von Bertalanffy Growth Function - VBGF) and movement pattern. Information on the type of study reporting movement pattern data is shown: FS - fishing surveys, MR - mark-rec...
Data
References used in the Supplemental Information section
Data
Dataset of experimental fishing surveys Raw data of experimental fishing surveys in the Luiz Saldanha Marine Park.
Article
Full-text available
The effects of two different slipping methods on the survival, physical and physiological response of sardines, Sardina pilchardus, captured in a purse-seine fishery were investigated in southern Portugal. Sardines were collected and transferred into holding tanks onboard a commercial fishing vessel after being captured, crowded and deliberately re...
Data
Survival estimates for sardine using Kaplan-Meier survival curves (dashed line), overlaid with the predictions from the selected mixture-distribution survival model M3 (solid lines with 95% confidence bands) for the three treatment replicates (1–3): Control, standard slipping (SS) and modified slipping (MS). (TIF)
Article
A new probabilistic approach is proposed to assess muricid species population abundances at scales relevant to both Ancient and Modern coastal fisheries. Motivated by the long-term goal of reconstructing the dynamics of exploited murex populations during Antiquity, the objective was to estimate the population density of the banded-dye murex, Hexapl...
Article
Full-text available
In Portugal it has been estimated that unreported catches represent one third of total catches. Herein, information on landings and total unreported catches (discards) by commercial métier were disaggregated into high taxonomic detail using published scientific studies. Fish accounted for 93.5% (115493 t) of overall unreported catches per year, fol...